Telegraph transmitter



C. PHILLIPS, JR. TELEGRAPH TRANSMITTER.

APPLICATION FILED OCT. I8, I920.

Patented Feb. 21, 1922.

ATI'ORNEY UNITED STAT Es PATENT caries,

-TELEGEAPH TRANSMITTER.

Specification of Letters Patent.

1 Application filedvoctober 1a, 1920; Serial No. 417,539.

To all may concern:

Be it known 1 that L, CHARLES -PHILLIPS, J r. a citizen 'of'the United States, residing at l hiladelphia, inthecounty of'Philadelphia and State of Pennsylvania, have invented new and 'useful- Improvements in Telegraph'Transinitters, of which the following is a specification. V

This invention relates to telegraphic transmittersand it has more particular reference to devices such as are usually em pioyed for transmitting messages in the orse, naval or other similar code, and it has for its main object to provide a code transmitter which will" facilitate to considerable degree the transmission of telegrams, messages and so forth.

Another object of this invention isthe provision of a telegraphic or code transmit ter' by theuseof which a comparatively inexperienced person can transmit a message mechanicallyin a simple, rapid and'accu rate manner-by merely striking the keys of a keyboard, each separate key whereofcorresponds to a part cular sign or character of the code or alphabet that is used, whether it he a Morseynaval or otherwise' I Astill further object of my invention is to provide a telegraphic or code transmitter by ith use of which the operator is providedlwith an accurate visual record of each letter, character or symbol, word or mes sage transmitted, wherebya great saving of time and labor is effected in that corrections are reduced tov a minimum.

With the foregoing andother objects in view as will later on be more apparent my invention consists essentially 1n the provislon of a series'of' key-stems connected t0- or integral with type levers similarly mounted and actuable in like manner to the keys of an ordinary type-writing machine, each said key-ta being formed with dotanddash (or othersui'table) insularly located contacts with which cooperate a spring influenced circuit closer when the key is depressed; whereas on the return stroke of the'key-stem said circuit closer is automaticallyheld out 'ofengage'ment with the said insularly located contacts In the further disclosure of the invention reference is to be had to the accompanying sheet of explanatory drawings constituting a partof this specification, and in which likecharacters of reference designate the same or corresponding parts in all the views.

Figurelis a fragmentary side elevation a portion of a transmitting machine constructed in 'accordance with the principle of my invention, only such parts of the bat- Figure 2 is a plan of thesame. Figure 3 is an enlarged side elevation of an individual transmitter key-stem and its associated parts.

Figure "4; is an elevation taken at right angles to the preceding figure.

F igure 5 is a sectional elevation of the same. t

Figure 6 is a side elevation showing the transmitter key-stem with the circuit closer as held in the inoperative position during a part of the return stroke of said key-stem. Figure-7 is a sectional plan taken on the line 7-7 in Figure 3L Referring to thedrawings I have shown my mproved code transmitter as applied to an ordinary typewriting -machine a por- .tion of the frame whereof is designated by the numeral 10 and having. the usual bat- .tery of keys 11, mounted on type levers 12,

llaten'ted Feb. 21,

guides 14 channel shaped in cross section as will be clearly seen on,reference to Figure 6, each said guidesl l constituting a housing for square section key-stems 15 depending from the aforesaid type levers 12.

Referring now more particularly to Figtires?) to 7 inclusive, it Willbeseen that each depending guide let is formed on opposed sides with slots 16 into which project laterally disposed pins 17 on the key-stem 15 and serving to limit the up and down movement thereofas well as retaining said key-stem in operative connection relative to the guide. Extending rearwards through a slot 18 in the back of the guide 14,-is a tongue or projection19 for the purpose hereafter expla ned, and attached to'said guide leis a flat sprlng 20 having an inwardly curved or arcuate portion .21, an outstanding part 22, and a turned over or latched upper end 23.

Pivoted on laterally projecting pintles 24 on the aforesaid guide 14 are opposed spaced levers 25 rigidly connected by a brace 26, and having secured between their forward ends a block of insulating material or hard rubber 27, and. it is to be particularly noted that the rear ends of said spaced levers 25 are extended suflicient to lie in the path of-,

hook 30 for one end vof a contractile spring 31, the other end whereof is connected to a bridge piece 32 on the guide 14.

Moulded or cut in the open face of the key-stem 15 are grooved or recessed portions 33 in which are firmly embedded fiber or other appropriate pieces of insulating material 34, which house and insulate coder contacts 35- corresponding in lengtlror proportion to the dots, dashes, or combinat ons thereof, constituting the particular code the instrument uses or is adapted for.

Appropriate recoil springs 36 may be fitted beneath each key-stem 15 to ensure their instantaneous return after each depression, and a line wire 37 is conveniently attached to a binding post 38 on the supporting member 13, and under the control of a switch in the usual manner.

From the foregoing description it willbe readily seen that when each individual key 11 is in its normal or raised position that the free end of the springy tongue 29 reposes on the lower insulating insert 34 so I that the circuit tllI'Ollgll'tllG line wire 37 is broken or open; whereas when said key is depressed in opposition to its recoil spring 36 the springy tongue 29 is traversed by the insular code contacts 35 one after another thus completing intermittent circuits through the instrument of duration conforming to the time of such'passage thereover, breaks taking place as. the tongue is V traversed by the insulating material between said contacts. It is to be particularly noted that as each key 11 and its attached stem 15 is depressed to nearly its fullest extent the latched or turned over upper end 23 of thespring 20 is engaged by the outer ends 39 of the spaced levers 25 and sprung V slightly away from the guide l4 until the parts 39 and 23 assume latched engagement as shown in Figure 6. Thus it will be clearly seen that on the release of the key 11 and its automaticreturn by the recoil spring 36, re-

transmission of the particular signal or code character transmitted .on the down-ward travel of the key over the contacts 35 in reverse order is efiectively prevented, release of the latch 23 and the outer ends 39 of the spaced levers 25 only taking place as the tongue '19 engages below and traversesthe arcuate 'porti on 2l of the spring 20. This latter release permits the contractile spring 31 to function and retract the springy tongue 29 to the normal or position shown in Figures 3 and 5. 7 y a As the several and successive keys ll are depressed the desired code words, letters or other signals will be transmitted to the other end of the line wire 37 where they may be received and recorded'in any, of the well known ways.

' Although I have confined this description more particularly tothe means employed to transmit an individual character or si nal, it will be readily understood by those skllled in the art to which my invention appertains that its application to the entire battery of keys 11 will only be mere duplication. Furthermore, I wish it clearly understood that many slight changes may be necessaryto adapt said invention forthe transmission of different codes, and I therefore do'notconfine myself to the precise'details of construction shown and described, but deem myself at liberty to incl'udeall such reasonable changes and other forms as may fairly, fall within the scope of the appended claim, 1 i

Having described my invention what I claim as new and desire-to secure bye-Letters Patent is:-- a

A telegraph transmitter 7,

spring influenced reciprocable key-stem having insular contacts thereon, a'statio nary guide housing said key-stem, means for limiting the movement of the key-stem in the guide, spring influencedwspaced levers pivotally mounted on the stationary guide and supporting an "insulated spring tongue circuit closer adapted to 'beiltrave rsed by the insular contacts when the keystemmoves forwardly, a recoillatch member carried by the guide and havingan offset and arcuate portions, said latch member holding the air; cuit closer out of engagement with the in'; sular contacts on the return stroke of the key-stem, and means on the'key-stem for,co-- 1 operation with'th'e arcuate part of. the latch member to release the circuit closer as the key-stem returns to normal position. 3 In testimon whereof I affix my si nature.

' HARLES HILL Ps, JR; 

